MMA fighter, Frank Shamrock's opinion on boxing

[Benny Leonard]

[Dynamite Kid]

I look at it like this, Boxing takes years! to master, some of these guys have been fighting since the age of 7/8 years old, Ali was a pro for something like 22 years if recall, thats not including his amateur fights, look how many athletes have made the transition to MMA, Shamrock is right, Boxing is a much harder sport to master.